2. Let some groups give a speech on the comparisons between the Chinese city and Iqaluit and share their views with others.
第二步 语言学习——同位语从句
1. Ask students to do Exercise 1 in Discovering useful structures on page 37.
2. Finish Exercise 2 in Discovering useful structures on page 37.
3. Observe the sentences in the exercises and then draw a conclusion.
Sum up: 同位语从句一般跟在某些名词（如fact, idea, news, promise等）的后面，用以说明或解释前面的名词，引导同位语的连词常用that。
第三步 语言运用练习（1）
Let students do Ex 1 in Using structures on page 71.
When finishing it, discuss with the partner and then check with the class.
第四步 语言运用练习（2）
1. Have students do Ex 2 in Using structures on page 71.
2. Ask two students to write down their emails on the blackboard and then encourage the others to make some changes in their work if necessary.
3. Exchange the work in groups of four, help each other to correct the mistakes and meanwhile try to appreciate the good sentences written by others.
4. Choose the best one in each group and read it out in class.
第五步 语言运用练习（3）（通过开放性的题目，以竞赛形式进行小组活动，巩固同位语从句。）
1. Translate the sentences with the appositive clauses.
① 毫无疑问他宁愿睡觉也不愿意去市中心逛街。
② 这么小的孩子居然解出了这道题，这个事实使我们很惊讶。
③她留下口信她已经在加拿大定居。